CN109723403A - Tail pipe pressure control well cementation process - Google Patents
Tail pipe pressure control well cementation process Download PDFInfo
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- CN109723403A CN109723403A CN201711040955.XA CN201711040955A CN109723403A CN 109723403 A CN109723403 A CN 109723403A CN 201711040955 A CN201711040955 A CN 201711040955A CN 109723403 A CN109723403 A CN 109723403A
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- 238000000034 method Methods 0.000 title abstract description 15
- 230000008569 process Effects 0.000 title abstract description 12
- 239000011148 porous material Substances 0.000 claims abstract description 31
- 238000005553 drilling Methods 0.000 claims description 58
- 238000005516 engineering process Methods 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 25
- 208000034656 Contusions Diseases 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 230000015271 coagulation Effects 0.000 abstract 1
- 238000005345 coagulation Methods 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 description 17
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 5
- 238000011010 flushing procedure Methods 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000003292 glue Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- -1 flushing liquor Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229940074869 marquis Drugs 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- VBUNOIXRZNJNAD-UHFFFAOYSA-N ponazuril Chemical compound CC1=CC(N2C(N(C)C(=O)NC2=O)=O)=CC=C1OC1=CC=C(S(=O)(=O)C(F)(F)F)C=C1 VBUNOIXRZNJNAD-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a tail pipe pressure control well cementation process, and belongs to the technical field of oil and gas development well cementation. The tail pipe pressure control well cementation process sequentially comprises the following steps: a casing running stage, a tail pipe hanger hanging stage, a cementing and displacing stage, a bumping and pulling-out stage and a waiting setting stage; in the casing running stage, the tail pipe hanger seating and hanging stage, the cementing and replacing stage, the bumping and pulling-out stage and the coagulation waiting stage, the well bottom circulation equivalent density of the well section with the narrow safety density window is kept between the pore pressure equivalent density and the fracture pressure equivalent density corresponding to the well section with the narrow safety density window by controlling the well head annular pressure. In the well cementation process, through well head annulus pressure control, the well bottom circulation equivalent density corresponding to the well section with the narrow safety density window is between the pore pressure equivalent density and the fracture pressure equivalent density, so that the pressure-bearing weak stratum is not pressed and leaked while the stable oil gas display layer position is pressed, the tail pipe well cementation construction risk is reduced, and the well cementation quality is improved.
Description
Technical field
The present invention relates to oil and gas development cementing technology field, in particular to a kind of tail pipe pressure control well shaft fixing technology.
Background technique
Drilling liner cementing is that casing is lowered into well by the tripping in tool such as drilling rod, and to the annular between the borehole wall and casing
Cement is injected in space, by the process of oil reservoir, gas-bearing formation and water layer packing in wellbore after theing cement solidifies, to protect oil/gas well set
Pipe increases the oil/gas well service life, is one of the important link of oil gas well drilling engineering.
Currently, the basic process of drilling liner cementing is, using sending production string to underground predeterminated position back seat to hang tail under drilling rod
Pipe hanger, carries out cementing using double rubber plug methods later and replaces construction, carries out bruising later and plays drill string, wait the cement solidifies
After complete drilling liner cementing.By being continuously improved to cement slurry property, including thickening time control, dehydration control, final setting time
Control, Auto-regulating System of Density of Heavy Medium etc., and meet the drilling liner cementing demand of different condition wellbore to the improvement of property of drilling fluid.
However, for narrow ' Safe Density Windows stratum, using existing drilling liner cementing technique be easy to cause leakage or
Aggravation leakage causes to alter on the oil gas of lower part well section so that head of liquid be caused to reduce, and interface cementing strength is low, causes to cement the well
It is off quality；And it is not easy to press stable high-pressure layer, alter on oil gas is easy；In addition, replacement efficiency is low, the borehole wall and casing in well cementing process
False filter cake, oil film and drilling fluid on wall are difficult to clean completely.The above problem often leads to high narrow ' Safe Density Windows stratum tail
Pipe cementing operation operation well control safety risk is high, it is difficult to which cementing quality guarantees, opens oil/gas well integrality, oil gas field long-term safety
Hair affects greatly.
Summary of the invention
In order to solve the above technical problems, the embodiment of the present invention, which provides one kind, can reduce narrow ' Safe Density Windows stratum
Drilling liner cementing construction risk tail pipe pressure control well shaft fixing technology.
Specifically, including technical solution below.
The embodiment of the invention provides a kind of tail pipe pressure control well shaft fixing technology, the tail pipe pressure control well shaft fixing technology successively includes:
Setting of casing stage, seat hang extension hanger stage, cementing and replace stage, bruising and play drill string stage and Hou Ning stage；
Extension hanger stage, the cementing are hung in the setting of casing stage, the seat and replace stage, the bruising
In drill string stage and the Hou Ning stage, by controlling well head annular pressure, make the shaft bottom of narrow ' Safe Density Windows well section
Circulation equal yield density is maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure equivalent
Between density.
Specifically, in the setting of casing stage, in the setting of casing stage, first with sending production string under drilling rod
The supreme casing shoe position for opening time protective casing, circulation reduces drilling fluid density and the pressure control equipment by the way that well head is arranged in later
Apply back pressure from well head, control well head annular pressure, so that the shaft bottom of the narrow ' Safe Density Windows well section is recycled equal yield density and protect
It holds between the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure equal yield density；Later,
Continuing with drilling rod will send under the production string to shaft bottom, the drilling fluid density of recycling adjustment later, and by being arranged in well
The pressure control equipment of mouth applies back pressure from well head, controls well head annular pressure, follows the shaft bottom of the narrow ' Safe Density Windows well section
Ring equal yield density is maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure equivalent is close
Between degree.
Specifically, the drilling rod is the steel pipe that one end has a chain for binding criminals line.
Specifically, it is hung in the extension hanger stage in the seat, puts into stifled ball, suppressed seat and hang extension hanger, and recycle
Drilling fluid；Pressure control equipment by the way that well head is arranged in controls well head annular pressure, makes the well of the narrow ' Safe Density Windows well section
Bottoming cycle equal yield density is maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure is worked as
Between metric density.
Specifically, in the cementing and in the replacement stage, the pressure control equipment by the way that well head is arranged in applies back from well head
Pressure controls well head annular pressure, so that the shaft bottom of the narrow ' Safe Density Windows well section is recycled equal yield density and is maintained at the narrow peace
Between the corresponding pore pressure equal yield density of theoretical density window well section and fracture pressure equal yield density, the back pressure value that is applied according to
Annular space slurry rod structure situation of change is calculated.
Specifically, it in the bruising and rises in the drill string stage, in the cementing and later period in stage is replaced, using starching again
It replaces to bruising；Pull out of hole the first pre-determined distance under pressure, circulation well cleanup, and trip-out second is default under pressure later
Distance by the drilling rod completely from underground out；Well head annular pressure is controlled, the shaft bottom of the narrow ' Safe Density Windows well section is made
Circulation equal yield density is maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure equivalent
Between density.
Specifically, it in the Hou Ning stage, requires to carry out well head annular space according to special cementing and builds the pressure Hou Ning, it is solidifying to cement
After Gu, cementing operation is completed.
Specifically, the tail pipe is seamless steel pipe.
Technical solution provided in an embodiment of the present invention the utility model has the advantages that
In tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention, in drilling liner cementing work progress, by controlling well
Mouth annular pressure makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at narrow ' Safe Density Windows well section corresponding
Pore pressure equal yield density and fracture pressure equal yield density between, it is ensured that do not press leakage to hold while pressing steady hydrocarbon show zones position
Weak formation is pressed, the risk for leading to well cementing operation failure is altered on the pressure leakage stratum that avoids new packer liner-hanger cementing operation from occurring on oil gas,
The drilling liner cementing construction risk of narrow ' Safe Density Windows well section is substantially reduced, while cementing quality can be increased substantially, improves well
Integrality meets later development production needs.
Tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention is for conventional sandstone, carbonate and other complicated narrow peaces
The drilling liner cementing construction of theoretical density window well section is applicable in, especially suitable for high temperature and pressure ultra-deep shaft well ' Safe Density Windows well section
Drilling liner cementing construction.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described
Fig. 1 is a kind of flow chart of tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention；
Fig. 2-1 is a kind of cementing operation curve graph of tail pipe pressure control well shaft fixing technology shown according to an exemplary embodiment；
Fig. 2-2 is the partial enlarged view of Fig. 2-1.
Wherein, 1. the number in Fig. 2-1 and Fig. 2-2, which represents, reduces mud density, 2. represents and adjusts mud property, 3. represents
Insulating liquid is infused, note flushing liquor is 4. represented, 5. represents cement injection, 6. represent back brake door, open backing pin, 7. represent injection pressure plug liquid, 8.
Note flushing liquor is represented, 9. represents and replaces mud.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.Unless otherwise defined, all technical terms used in the embodiment of the present invention all have and art technology
The normally understood identical meaning of personnel.
Tail pipe be directed in the well of tripping in protective casing tripping in, top do not extend into the casing string of well head.Tail pipe
By drilling rod tripping in, drilling rod is risen after cemented up.Narrow ' Safe Density Windows well section refers to the formation fracture pressure of the well section
It is not much different with formation pore pressure, the density range very little that drilling fluid can choose, Yi Fasheng drilling complexity situation, drilling fluid
Density causes leakage beyond this range, cave-in chip off-falling is caused lower than this range, for this kind of well section, in drilling liner cementing process
In be easy to appear on oil gas and alter or the problem of leakage, cause well cementation to fail, or even safety accident can be caused.
Based on the above, the embodiment of the invention provides a kind of tail pipe pressure control well shaft fixing technologies, referring to Fig. 1, the tail pipe control
Pressure well shaft fixing technology successively includes: setting of casing stage, seat extension extension hanger stage, cementing and replaces stage, bruising and trip-out
Column stage and Hou Ning stage.
Wherein, extension hanger stage, cementing are hung in setting of casing stage, seat and replaces stage, bruising and a drill string rank
In section and Hou Ning stage, by controlling well head annular pressure, the shaft bottom of narrow ' Safe Density Windows well section is made to recycle equal yield density
(ECD) it is maintained between the corresponding pore pressure equal yield density of narrow ' Safe Density Windows well section and fracture pressure equal yield density.
In tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention, in drilling liner cementing work progress, by controlling well
Mouth annular pressure makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at narrow ' Safe Density Windows well section corresponding
Pore pressure equal yield density and fracture pressure equal yield density between, it is ensured that do not press leakage to hold while pressing steady hydrocarbon show zones position
Weak formation is pressed, the risk for leading to well cementing operation failure is altered on the pressure leakage stratum that avoids new packer liner-hanger cementing operation from occurring on oil gas,
The drilling liner cementing construction risk of narrow ' Safe Density Windows well section is substantially reduced, while cementing quality can be increased substantially, improves well
Integrality meets later development production needs.
Well head annular pressure involved in the embodiment of the present invention refers to the technology set for being applied to well mouth drill and tripping in
Annular pressure value between pipe.
Specifically, in the setting of casing stage, first with sending production string the supreme casing for opening time protective casing under drilling rod
Shoes position, circulation reduces drilling fluid density later, and the pressure control equipment by the way that well head is arranged in applies back pressure from well head, controls well
Mouth annular pressure makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at narrow ' Safe Density Windows well section corresponding
Pore pressure equal yield density and fracture pressure equal yield density between；Later, continuing with drilling rod will send under production string to well
Bottom, the drilling fluid density of recycling adjustment later, and the pressure control equipment by the way that well head is arranged in applies back pressure from well head, controls well head
Annular pressure makes the shaft bottom circulation equal yield density of narrow ' Safe Density Windows well section be maintained at narrow ' Safe Density Windows well section corresponding
Between pore pressure equal yield density and fracture pressure equal yield density.To guarantee the construction safety in setting of casing stage.
It, can be using drilling rod+crossover sub+running tool+hanger+casing+bruising assembly+floating in the setting of casing stage
The combination of hoop+casing shoe pipe string will be under production string lower going-into-well.
In the embodiment of the present invention, drilling rod can be used one end and have for connecting drilling machine landscape apparatus and downhole tool, equipment
The steel pipe of a chain for binding criminals line, it is to be understood that screwed one end is used for through the tools such as crossover sub and the oil reservoir for needing tripping in
Casing connection.
Specifically, it is present and hangs in the extension hanger stage, put into stifled ball, suppress seat later and hang extension hanger, and recycle
Drilling fluid.In the process, well head annular pressure is controlled by the way that the pressure control equipment of well head is arranged in, makes narrow ' Safe Density Windows well
The shaft bottom circulation equal yield density of section is maintained at the corresponding pore pressure equal yield density of narrow ' Safe Density Windows well section and fracture pressure
Between equal yield density.
The present control for hanging the well head annular pressure during extension hanger can continue the well head annular space in setting of casing stage
Pressure control.
Specifically, in cementing and in the replacement stage, isolation before being injected by equipment such as cementing truck, slush pumps into annular space
The liquid such as liquid, flushing liquor, cement slurry, tamponade liquid, overflush fluid, displacement fluid, it is same by the way that well head is arranged in the process
Pressure control equipment applies back pressure from well head, controls well head annular pressure, works as so that the shaft bottom of narrow ' Safe Density Windows well section be made to recycle
Metric density is maintained between the corresponding pore pressure equal yield density of narrow ' Safe Density Windows well section and fracture pressure equal yield density.Institute
The back pressure value of application is starched rod structure situation of change according to annular space and is calculated.
Specifically, in bruising and a drill string stage, in cementing and the later period in replacement stage, i.e., after injection replaces night
Phase is replaced to bruising using slurry again (i.e. drilling fluid of the density greater than cement slurry density), closes the glue core of well head rotating blowout preventer,
Guarantee the sealing in trip-out process between drilling rod and rotating blowout preventer, so that first pre-determined distance that pulls out of hole under pressure, is followed
Washing-round well, pull out of hole the second pre-determined distance under pressure later；Well head annular pressure is controlled, narrow ' Safe Density Windows well section is made
Shaft bottom circulation equal yield density be maintained at the corresponding pore pressure equal yield density of narrow ' Safe Density Windows well section and fracture pressure is worked as
Between metric density.
For example, the first pre-determined distance can be 10 columns, and the second pre-determined distance can be 1 column, wherein a column includes three
Root drilling rod, every drilling rod are about 9 meters long.
Specifically, in the Hou Ning stage, requiring progress well head to build the pressure Hou Ning in conjunction with special cementing at the same time can basis
The back pressure value that final annular space slurry rod structure applies needed for calculating, the pressure control equipment by the way that well head is arranged in apply back pressure from well head,
Well head annular pressure is controlled, so that the shaft bottom of narrow ' Safe Density Windows well section is recycled equal yield density and is maintained at narrow ' Safe Density Windows well
Between the corresponding pore pressure equal yield density of section and fracture pressure equal yield density, to guarantee the safety in Hou Ning stage.It is complete to cement
After full solidification, cementing operation is completed.
Specifically, in tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention, for controlling the control of well head annular pressure
Pressure equipment may include swivel control head, self-choke control sled, back pressure compensation pump, data acquistion and control system etc..For
The levels of precision embodiment of the present invention of pressure control setting is not particularly limited, can be according to the Pore Pressure of narrow ' Safe Density Windows well section
Power and the gap of formation fracture pressure determine.When pore pressure and larger formation fracture pressure gap, can choose accurate
The lower pressure control equipment of degree；And when pore pressure and smaller formation fracture pressure gap, it is higher to can choose levels of precision
Pressure control equipment.
In tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention, tail pipe is oil/gas well seamless steel pipe.
Tail pipe pressure control well shaft fixing technology provided in an embodiment of the present invention is done further in detail below by Specific construction data
Thin description.
By certain well tail pipe pressure control well cementation for, Φ 139.7mm wellbore drilling after the completion of, using Φ 114.3mm tail pipe into
Row sealing 5858.00m~6737.00m well section, the well safe Density Window of the wellbore are 2.27~2.38g/cm3。
It specifically includes:
(1) setting of casing: Φ 101.6mm × S135 × 8.38mm drilling rod+crossover sub+running tool+Φ 114.3mm is used
Hanger+Φ 114.3mm × TP155V × 8.56mm casing+bruising assembly+float collar+casing shoe joint string combination, is lowered into upper layer
When at the casing shoe 6008.00m of protective casing, circulation reduces drilling fluid density to 2.22~2.23g/cm3Afterwards by well head annular space
Pressure control is sent at 2.5~3.0MPa at tail pipe to the position well depth 6737.00m, and pressure control circulation adjustment drilling fluid density is extremely
2.20g/cm3Well head annular pressure is controlled in 6.6~7.0MPa afterwards.
(2) seat hangs extension hanger: by the control of well head annular pressure in 6.6~7.0MPa, putting into D34mm copper ball, later
Marquis's seat suppresses the hanging hanging device of seat.
(3) cementing and replacement construction: well head annular pressure is controlled in 6.6~7.0MPa, and in ground batch mixing cement
Slurry successively carries out: insulating liquid 7m before positive injection3(pump pressure 10.4~15.8MPa, 0.48~0.53m of discharge capacity3/ min), positive injection flushing liquor
0.5m3(pump pressure 11.0-12.0MPa, 0.5~0.53m of discharge capacity3/ min), positive injection praise G grades of highly resistance oil well extended slurry 7.3m of China3
(cement dry ash 25t is pumped 14.0~16.0MPa, 0.48~0.51m of discharge capacity3/ min, cement slurry density are averaged 2.35g/cm3)、
G grades of highly resistance oil well quick-drying cement slurry 2.2m of positive injection3(cement dry ash 10t is pumped 13.0~15.0MPa, 0.48~0.51m of discharge capacity3/
Min, cement slurry density are averaged 2.35g/cm3), later by well head annular pressure control in 6.6MPa back brake door, later successively into
Row: positive injection density is 2.35g/cm3Tamponade liquid 0.2m3(pump pressure 12.0-13.0MPa, 0.45~0.50m3/min of discharge capacity), just
Infuse overflush fluid 0.5m3(pump pressure 12.0~14MPa, 0.49~0.52m of discharge capacity3/min)；Positive injection displacement fluid 35.3m3(pump pressure
9.81~15.6MPa, 0.45~0.52m of discharge capacity3/min)。
(4) bruising is with a drill string: slush pump is just replacing density 2.20g/cm3Drilling fluid 3.0m3(pump pressure 14.4~
15.6MPa, 0.45~0.52m of discharge capacity3/ min), density 2.5g/cm3Weighted drilling fluid 13.0m3(9.8~15.6MPa of pump pressure,
0.45~0.52m of discharge capacity3/ min), density 2.3g/cm3Insulating liquid 8.0m3(9.8~15.6MPa of pump pressure, discharge capacity 0.45~
0.52m3/ min), just replace density 2.20g/cm3Drilling fluid 13.6m3(pump pressure 9.8~15.6MPa, 0.45~0.52m of discharge capacity3/
Min), 11.52 ↑ 18.36MPa of the vertical pressure of bruising.10 columns of fine pressure control glue core pressure control 6.6MPa trip-out, circulation well cleanup, control are closed later
Press 6.6MPa 1 column of trip-out.
(5) Hou Ning: annular space well head builds the pressure 8MPa Hou Ning, and construction is completed.
As shown in Fig. 2-1 and Fig. 2-2, to guarantee that the cementing operation of tail pipe pressure control is smoothly implemented, the lower supreme layer casing shoe of tail pipe
Place carries out reducing mud density operation, and drilling fluid density is reduced to 2.22~2.23g/cm3Use ground pressure control equipment will afterwards
The control of well head annular pressure carries out tail pipe under pressure control in 2.5~3.0MPa, on earth afterwards by drilling fluid density by 2.22g/ under tail pipe
cm3It is down to 2.20g/cm3, while being controlled well head annular pressure in 7MPa by ground pressure control equipment, at this point, shaft bottom circulation is worked as
Metric density is 2.307g/cm3, between formation pore pressure equal yield density 2.27g/cm3With formation fracture pressure equal yield density
2.38g/cm3Between, press quietly layer.Meanwhile from Fig. 2-2 as can be seen that in cementing and displacement process, in turn on pump state
Under (be pumped not for 0), add annular pressure lost by quiet night column pressure, work as shaft bottom circulation equal yield density between formation pore pressure
Between metric density and formation fracture pressure equal yield density, quietly layer is pressed；It need not carry out well head annular space pressure control；Under termination of pumping state
(i.e. pump pressure is 0), need to control well head annular pressure in 6.6~7.0MPa, make shaft bottom circulation equal yield density between formation pore
Between pressure equivalent density and formation fracture pressure equal yield density, quietly layer is pressed.
To sum up, it the embodiment of the invention provides a kind of tail pipe pressure control cementing technology, is controlled, is made narrow by well head annular pressure
The corresponding shaft bottom circulation equal yield density of ' Safe Density Windows well section is between formation pore pressure equal yield density and formation fracture pressure
Between equal yield density, it is ensured that do not press leakage pressure-bearing weak formation while pressing steady hydrocarbon show zones position, it is close to substantially reduce narrow safety
The drilling liner cementing construction risk of window well section is spent, realizes near-banlanced cementing, improves cementing quality, improves well integrality, it is ensured that open
Send out benefit.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (8)
1. a kind of tail pipe pressure control well shaft fixing technology, which is characterized in that the tail pipe pressure control well shaft fixing technology successively includes: setting of casing rank
Section, seat hang extension hanger stage, cementing and replace stage, bruising and play drill string stage and Hou Ning stage；
Extension hanger stage, the cementing and replacement stage, the bruising are hung in the setting of casing stage, the seat and are risen
In drill string stage and the Hou Ning stage, by controlling well head annular pressure, recycle the shaft bottom of narrow ' Safe Density Windows well section
Equal yield density is maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and fracture pressure equal yield density
Between.
2. tail pipe pressure control well shaft fixing technology according to claim 1, which is characterized in that in the setting of casing stage, first
Using sending production string the supreme casing shoe position for opening time protective casing under drilling rod, circulation reduces drilling fluid density and passes through later
The pressure control equipment that well head is arranged in applies back pressure from well head, controls well head annular pressure, makes the narrow ' Safe Density Windows well section
Shaft bottom circulation equal yield density be maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and rupture pressure
Between power equal yield density；Later, continuing with drilling rod will send under the production string to shaft bottom, the drilling fluid of recycling adjustment later
Density, and the pressure control equipment by the way that well head is arranged in applies back pressure from well head, controls well head annular pressure, keeps the narrow safety close
It is close that the shaft bottom circulation equal yield density of degree window well section is maintained at the corresponding pore pressure equivalent of the narrow ' Safe Density Windows well section
Between degree and fracture pressure equal yield density.
3. tail pipe pressure control well shaft fixing technology according to claim 2, which is characterized in that the drilling rod is one end with a chain for binding criminals line
Steel pipe.
4. tail pipe pressure control well shaft fixing technology according to claim 1, which is characterized in that hang the extension hanger stage in the seat
In, stifled ball is put into, seat is suppressed and hangs extension hanger, and circulating fluid；Pressure control equipment by the way that well head is arranged in controls well head
Annular pressure makes the shaft bottom of the narrow ' Safe Density Windows well section recycle equal yield density and is maintained at the narrow ' Safe Density Windows well
Between the corresponding pore pressure equal yield density of section and fracture pressure equal yield density.
5. tail pipe pressure control well shaft fixing technology according to claim 1, which is characterized in that in the cementing and replace the stage
In, the pressure control equipment by the way that well head is arranged in applies back pressure from well head, controls well head annular pressure, makes the narrow Safe Density window
The shaft bottom circulation equal yield density of mouthful well section be maintained at the corresponding pore pressure equal yield density of the narrow ' Safe Density Windows well section and
Between fracture pressure equal yield density, the back pressure value applied is starched rod structure situation of change according to annular space and is calculated.
6. tail pipe pressure control well shaft fixing technology according to claim 1, which is characterized in that in the bruising and rise the drill string stage
In, in the cementing and the later period in replacement stage, replaced using slurry again to bruising；Pull out of hole under pressure first it is default away from
From, circulation well cleanup, second pre-determined distance that pulls out of hole under pressure later by the drilling rod completely from underground out；Control well head
Annular pressure makes the shaft bottom of the narrow ' Safe Density Windows well section recycle equal yield density and is maintained at the narrow ' Safe Density Windows well
Between the corresponding pore pressure equal yield density of section and fracture pressure equal yield density.
7. tail pipe pressure control well shaft fixing technology according to claim 1, which is characterized in that in the Hou Ning stage, according to answering in advance
Power cementing requirements carry out well head annular space and build the pressure Hou Ning, after theing cement solidifies, complete cementing operation.
8. described in any item tail pipe pressure control well shaft fixing technologies according to claim 1~7, which is characterized in that the tail pipe is seamless
Steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711040955.XA CN109723403A (en) | 2017-10-30 | 2017-10-30 | Tail pipe pressure control well cementation process |
Applications Claiming Priority (1)
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| CN113622865A (en) * | 2021-08-26 | 2021-11-09 | 中海石油(中国)有限公司 | Tail pipe pressure control well cementation method under packer setting condition |
| CN114482916A (en) * | 2021-12-27 | 2022-05-13 | 中海石油(中国)有限公司 | Method, device and medium for analyzing tail pipe pressure control and coagulation waiting construction parameters with packer |
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| CN114482916A (en) * | 2021-12-27 | 2022-05-13 | 中海石油(中国)有限公司 | Method, device and medium for analyzing tail pipe pressure control and coagulation waiting construction parameters with packer |
| CN114482916B (en) * | 2021-12-27 | 2024-02-13 | 中海石油(中国)有限公司 | Tail pipe controlled pressure weather coagulation construction parameter analysis method, device and medium with packer |
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